Question

define atomic number? 7th class​

Answer 1

Answer:

The atomic number of an element is the total number of protons present in the atom of that element. For example, nitrogen has 7 protons in its atom. Thus, the atomic number of nitrogen is 7. The mass number of an element is the sum of the number of protons and neutrons present in the atom of that element.

Answer 2

Answer:

atomic number, the number of a chemical element in the periodic system, whereby the elements are arranged in order of increasing number of protons in the nucleus. Accordingly, the number of protons, which is always equal to the number of electrons in the neutral atom, is also the atomic number.